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RE: [PATCH v4 04/14] xen/arm: flushtlb: Reduce scope of barrier for the TLB range flush
- To: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Fri, 13 Jan 2023 13:53:39 +0000
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- Cc: Luca Fancellu <Luca.Fancellu@xxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Fri, 13 Jan 2023 13:53:58 +0000
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- Thread-topic: [PATCH v4 04/14] xen/arm: flushtlb: Reduce scope of barrier for the TLB range flush
Hi Julien,
> -----Original Message-----
> Subject: [PATCH v4 04/14] xen/arm: flushtlb: Reduce scope of barrier for the
> TLB range flush
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> At the moment, flush_xen_tlb_range_va{,_local}() are using system
> wide memory barrier. This is quite expensive and unnecessary.
>
> For the local version, a non-shareable barrier is sufficient.
> For the SMP version, an inner-shareable barrier is sufficient.
>
> Furthermore, the initial barrier only needs to a store barrier.
>
> For the full explanation of the sequence see asm/arm{32,64}/flushtlb.h.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
Reviewed-by: Henry Wang <Henry.Wang@xxxxxxx>
Kind regards,
Henry
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